How soon can a platy fish get pregnant after giving birth?

I have a female platy fish who I presume is pregnant because she has the blackness in her stomach above her anal fin. A little over a week ago, I assumed that she gave birth because there were several new fry in my tank. But now that I have just looked at her again, there it remains, the blackness in her belly. Her belly is still fairly large as well. I’m now assuming that one of my other females were the one to give birth to the new platy seems how I cannot see if she has the blackness in her belly; she is a painted platy fish. Or maybe my fish did give birth and she’s just pregnant again. So I’m wondering how long after a platy gives birth can she get pregnant again?

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